diff --git a/Dockerfile.in b/Dockerfile.in
index 604d2f28..2fc0993e 100644
--- a/Dockerfile.in
+++ b/Dockerfile.in
@@ -15,6 +15,8 @@
 FROM @BASEIMAGE@
 MAINTAINER Random Liu <lantaol@google.com>
 
+RUN clean-install bash
+
 # Avoid symlink of /etc/localtime.
 RUN test -h /etc/localtime && rm -f /etc/localtime && cp /usr/share/zoneinfo/UTC /etc/localtime || true